Abstract: An experimental study of compressible gas-solidtwo-phase flow has been carried out in a horizontal circular shock tube. Thegas parameters before and after shock waves interact with the particle grouphave been measured using a pressure measurement system which consists ofsensors, amplifiers, oscilloscope and computer. The pressures and velocitiesbehind the incident, reflected and transmitted shock waves have beenmeasured. The influences of particle material, loading ratio of particles,driven gas and incident-shock Mach number on the aerodynamic characteristicshave been examined. It is found that, during the interaction of shock waveswith a particle group, the reflection and transmission of shock waves dependon the parameters of driven gas, particle material, the loading ratio and soon. The attenuation rate of shock wave decreases with the increase of theloading ratio of particles and the incident-shock Mach number. It issuggested that at the initial stage of particles acceleration driven byshock waves, elastic collision among particles may play an important role.